William d



PATENTED AUG. 25, 1868,

W. D. RICHARDSON. WOODEN PAVEMENT.

v V8.72 ol hitch tetra WILLIAM D. RICHARDSON, OF SPRINGFIELD, ILLINOIS.

Letters Patent No. 81,540, dated August 25, 1868.

IMPROVED wooosu PAVEMENT. I

Be it known that I, WILLIAM D. RICHARDSON, of Springfield, Ssngemon. county, Illinois, hevc'invented a new, useful, and improved Wooden Pavement for streets; and I do hereby declare that the following is a. full, exact, and clear description of the construction and operation of the some, reference being had to the annexed drawings, and to the letters of reference marked thereon.

Figure 1 is block A, shaped so as to form a tcnon.

Figure 2, blocks and truss-strip:v

Figure 3, isometricul view.

Figure 4, longitudinnlsection.

Figure 5, transverse section.

The construction is as follows- 1 V The street being properly graded in the form of an arch, the stringers B are laid across it from curb to curb, haying break-joints in relation to each other. Said stringers are from sixteen to twenty feet long, end

before laid down are dipped in tar. The blocks A also being dipped in tar, are placed close together at the butt, and nailed to the sides of the stringers 13,26 represented in figs. 3 and 5, and also resting upon the top of stringers B, as represented in figs. 2 end 4. The crcviees between the blocks and stringers are then filled with concrete matter, a. composition of tar and gravel, which rests upon the transverse beams, and fills the interstices, untl makes the surface perfectly smooth and impervious to water. The form being that of an arch, any.

weight upon it only tends to press thebloehs and stringers closer together; and it cannot be crushed down on n. level, even it on opening is formed underneath by the earth sinking away.

I claim a wooden pavement, cohstructerl of truusvcrse-:u'ching beams, either whole, or the parts of which break joints, end which support the shouldered blocks of described shape, the interstices being filled with concrete,

- which concrete rests upon the transverse beams, all substantially as described and for the purposes set forth.

I W. D. RICHARDSON.

Witnesses:

D. O. BHIEKERIIOLF, G130. U. )Inhcr. 

